Harvard sent out a campus-wide alert around 9 a.m. and issued an evacuation of the Science Center and Thayer, Sever, and Emerson halls, claiming that the school had received an unconfirmed report that bombs or explosive devices had been put in those four places.

Shortly before 11 a.m., HUPD spokesperson Steven G. Catalano said in a phone interview that no explosives had been found at that point.

The bomb scare led Harvard administrators to cancel a handful of exams in the affected buildings, spurring many on Twitter to joke that it must've been a stressed undergraduate that phoned in the threat. Students on campus reportedly applauded when Dean of Undergraduate Education Jay Harris announced the cancellations.

Administrators "are working to identify and reschedule exams that were scheduled to take place this morning" in affected buildings, Dean of Finance Leslie A. Kirwan told the Crimson in an email. The schools "will communicate guidance about exams scheduled to take place this afternoon as soon as possible."